PRIMULACE^E. (PRIMROSE FAMILY.) 285 



5. STEIRONEMA, Raf. 



Perennials, glabrous except the ciliate petioles: leaves all opposite, but 

 mostly in seeming whorls on the flowering branches : flowers yellow. 



1. S. ciliatum, Raf. Stem erect, 2 to 4 feet high, mostly simple: leaves 

 ovate-lanceolate or oblong-ovate, gradually acuminate, 2 to 5 inches long, and 

 mostly with a rounded or snbcordate base, minutely ciliate ; the long petioles hir- 

 sutely ciliate. Gray, Proc. Am. Acad. xii. 62. Lysimachia ciliata, L. New 

 Mexico to British Columbia and eastward across the continent. 



2. S. lanceolatum, Gray. Stem erect, 1 to 2 feet high, simple or panicu- 

 lately branched, somewhat angled : leaves lanceolate or linear, 1 to 2 inches long, 

 tapering info a short and margined ciliate petiole or attenuated base ; the radical 

 and sometimes lowest cauline from oblong to orbicular, small : divisions of the 

 corolhi conspicuously erose and cuspidate-acuminate. Proc. Am. Acad. xii. 

 62. Lysimachia lanceolata, Walt. Dakota and Nebraska to Louisiana and 

 eastward. 



Var. hybridum, Gray. Cauline leaves mostly petioled, from oblong to 

 broadly linear. Synopt. Fl. ii. 62. The commoner form westward. 



6. GLAUX, Tourn. SEA-MILKVVORT. 



Flowers dimorphous. A low and leafy fleshy perennial. 



1. G. maritima, L. Glabrous and glaucous or pale, perennial by slender 

 running rootstocks : stems a span or less high, erect or spreading : leaves 

 from oval to oblong-linear, i to ^ inch long, entire, sessile: calyx-lobes oval, **" 

 purplish or white. Salt marshes along both sea-coasts ; also in subsaline soil 

 in the interior west of the Mississippi. 



7. CENTUNCULUS, Dill. CHAFPWEBD. 



Very small glabrous annuals, with mainly alternate leaves, and solitary in- 

 conspicuous flowers in their axils. 



1. C. minimus, L. Stems ascending, 2 to 6 inches long: leaves ovate, 

 obovate, or spatulate-obloug, contracted or tapering at base, all but the lowest 

 sessile: calyx-lobes lanceolate-subulate. From Illinois to Texas and west- 

 ward to Oregon. 



8. SAMOLUS, Tourn. BROOKWEED. WATER PIMPERNEL. 



Low and glabrous herbs; with entire leaves, and small white flowers in 

 simple or panicled racemes. 



1- S. Valerandi, L., var. Americanus, Gray. Stem erect, slender, 

 leafy, becoming diffusely branched : leaves obovate : racemes often panicled ; 

 bracts none; bractlets on the middle of the slender, spreading pedicels. 

 Wet places, across the continent. 



